A convex and a concave mirror of radii 10 cm each are facing each other and 15 cm apart. A point object is placed midway between them. Then position of the final image if the reflection first takes place at the concave mirror and then in the convex mirror is
  • at the pole of the concave mirror
  • at the pole of the convex mirror
  • 5 cm behind the convex mirror
  • coincident with the object itself
When the object is located at the F of a concave mirror then
  • Image is of same size
  • image will be formed at infinity
  • Image is reduced in size
  • Image is magnified
The focal length of a convex lens (refractive index = 1.5) in air is 20 cm. When immersed in water (refractive index = 1.33), its focal length will be
  • 20.2cm
  • 78.23 cm
  • 7.23 cm
  • 2.02 cm
In Concave Mirror
  • Reflecting surface is towards the centre of the sphere of which it can be considered as a cut off portion.
  • Reflecting surface is on the opposite side of the centre of the sphere of which it can be considered as a cut off portion.
  • Both a and b.
  • Concave mirror does not exist.
In mirrors how can we differentiate real image from the virtual image
  • Virtual image is always inverted whereas real is erect.
  • Real image is always inverted whereas virtual image is erect.
  • Real image is always twice in size as compared to virtual.
  • Real and virtual both are same.
______ mirror is called as diverging mirror
  • Concave
  • Plane
  • Convex
  • Both b and c
Newtonian reflecting type telescope uses
  • Concave mirror
  • Convex lens
  • Concave lens
  • Convex mirror
According to the mirror formula
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  • A
  • B
  • C
  • D
In a concave mirror when the object is located beyond C the magnification is
  • More than 1
  • Equal to 1
  • Less than 1
  • Both a and b
An image is upright and reduced in size. Which mirror is used to form such an image?
  • Convex
  • Concave
  • Plane
  • Both a and c
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